questdb: Very frequent random crash

Describe the bug

We are seeing the very frequent crash. there is no particular sequence or with certain data. the crash is really random.

A fatal error has been detected by the Java Runtime Environment: SIGSEGV (0xb) at pc=0x00007f88f8bfd930, pid=548526, tid=548553 JRE version: OpenJDK Runtime Environment AdoptOpenJDK (11.0.9.1+1) (build 11.0.9.1+1) Java VM: OpenJDK 64-Bit Server VM AdoptOpenJDK (11.0.9.1+1, mixed mode, tiered, compressed oops, parallel gc, linux-amd64) Problematic frame: J 2408 c2 io.questdb.cairo.vm.api.MemoryCR.getLong(J)J io.questdb@6.2 (44 bytes) @ 0x00007f88f8bfd930 [0x00007f88f8bfd8c0+0x0000000000000070]

No core dump will be written. Core dumps have been disabled. To enable core dumping, try “ulimit -c unlimited” before starting Java again

stdout-2022-04-07T22-34-26.txt](https://github.com/questdb/questdb/files/8446400/stdout-2022-04-07T22-34-26.txt) hs_err_pid548526.log

To reproduce

There is no particular step to reproduce the issue. issues are seen very often with our test case environment

Expected Behavior

questDB running continuously with out interruption

Environment

- **QuestDB version**:6.2
- **OS**: ubuntu 20.04
- **Browser**:

Additional context

No response